When the three younger Penderwick sisters go to Maine with Aunt Claire and are separated from oldest sister Rosalind for the first time in their lives, an uncertain Skye is left in charge as the OAP--oldest available Penderwick.

"Nine-year-old Julian almost died when he was born and he believes that he has a special connection to the universe because of that, and he wants to make his two moms and his sister (who turned into a black hole of discontentment when she turned fourteen) happy because he is convinced that soon he will die and travel to the dog star--but now they have moved to Maine and he resolves to also use his "uni-sense" ability to help Mr. X, their neighbor,...